Physics – Condensed Matter – Statistical Mechanics
Scientific paper
1999-05-14
Physics
Condensed Matter
Statistical Mechanics
4 Pages, to appear on PRE
Scientific paper
10.1103/PhysRevE.60.1500
In this letter we present the inversion of the Mermin-Wagner theorem on graphs, by proving the existence of spontaneous magnetization at finite temperature for classical spin models on transient on the average (TOA) graphs, i.e. graphs where a random walker returns to its starting point with an average probability $\bar F < 1$. This result, which is here proven for models with O(n) symmetry, includes as a particular case $n=1$, providing a very general condition for spontaneous symmetry breaking on inhomogeneous structures even for the Ising model.
Burioni Raffaella
Cassi Davide
Vezzani Alberto
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